[libxml2] Make sure that Python tests exit with error code

[Nick Wellnhofer <nwellnhof src gnome org>]

commit d188eb921a835e0ec40f0d9b974c27f7abf4fbc0
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Mon Oct 21 12:44:59 2019 +0200

    Make sure that Python tests exit with error code
    
    Closes #108.

 python/tests/Makefile.am | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)
---
diff --git a/python/tests/Makefile.am b/python/tests/Makefile.am
index d44101c3..227e24df 100644
--- a/python/tests/Makefile.am
+++ b/python/tests/Makefile.am
@@ -62,15 +62,17 @@ if WITH_PYTHON
 tests: $(PYTESTS)
        @for f in $(XMLS) ; do test -f $$f || $(LN_S) $(srcdir)/$$f . ; done
        @echo "## running Python regression tests"
-       -@(PYTHONPATH="..:../.libs:$(srcdir)/..:$$PYTHONPATH" ; \
-          export PYTHONPATH; \
-          LD_LIBRARY_PATH="$(top_builddir)/.libs:$$LD_LIBRARY_PATH" ; \
-          export LD_LIBRARY_PATH; \
-          export PATH="$(top_builddir)/.libs:$$PATH" ; \
-          for test in $(PYTESTS) ; \
-          do log=`$(PYTHON) $(srcdir)/$$test` ; \
-          if [ "`echo $$log | grep OK`" = "" ] ; then \
-          echo "-- $$test" ; echo "$$log" ; fi ; done)
+       @(export PYTHONPATH="..:../.libs:$(srcdir)/..:$$PYTHONPATH" ; \
+         export LD_LIBRARY_PATH="$(top_builddir)/.libs:$$LD_LIBRARY_PATH" ; \
+         export PATH="$(top_builddir)/.libs:$$PATH" ; \
+         for test in $(PYTESTS) ; do \
+           log=`$(PYTHON) $(srcdir)/$$test` ; \
+           if [ "$$?" -ne 0 ] ; then \
+             echo "-- $$test" ; \
+             echo "$$log" ; \
+             exit 1 ; \
+           fi ; \
+         done)
 else
 tests:
 endif